Li Wenjun, Xing Guanping, Wang Zhengwei, Liang Shuangshuang, Lu Huale, Tan Yunhong, Wei Jie, Nie Zhulan
College of Life Science and Technology, Tarim University, Alar 843300, China.
Xinjiang Production & Construction Corps Key Laboratory of Protection and Utilization of Biological Resources in Tarim Basin, Alar 843300, China.
Animals (Basel). 2025 Aug 22;15(17):2469. doi: 10.3390/ani15172469.
In late August and mid-November 2024, and late February and mid-May 2025, four surveys were conducted in the Kalasuke Reservoir section of the Irtysh River, resulting in the collection of 296 samples of . Sampling tools included drift gillnets with a mesh size of 5 cm and an outer mesh size of 10 cm, bottom cages with a mesh size of 1 cm, and fishing rods (4.5 m and 5.4 m). The age structure and growth characteristics of in the reservoir were analyzed. Results showed that the body length of the sampled fish ranged from 100.53 to 305.30 mm, with the dominant length group being 100.53-150.00 mm, accounting for 90.09% of the total. Body mass ranged from 24.20 to 490.20 g, with the dominant mass group below 66.5 g, accounting for 89.86%. The age composition of the population consisted of age classes 1-5, with ages 1-2 years old being dominant, accounting for 96.2% of the total samples. Among these, 1-year-old individuals were the most abundant, accounting for 78.3%, while older fish were relatively scarce. The relationship between body length () and body mass () was modeled as = 4.298 × 10 ( = 0.998, = 296). The von Bertalanffy growth equations were = 652.866 [1 - ()] and = 4990.21 [1 - ()], with a growth coefficient = 0.108. The inflection point of growth was determined to be 1.9 years by fitting growth rate and acceleration equations. The < 3 indicates allometric growth, where body length increases faster than body mass, suggesting that prioritizes elongating its body to enhance swimming ability and expand its range, while accumulating muscle and fat at a slower pace. Principal component analysis (PCA) revealed that the cumulative contribution rate of the first three principal components was 55.45%, reflecting the morphological characteristics of the species. The accuracy of discriminant analysis for sex determination based on external morphology was 67.20%, indicating limited reliability in gender identification using only morphological traits.
2024年8月下旬、11月中旬以及2025年2月下旬、5月中旬，在额尔齐斯河卡拉苏克水库段进行了四次调查，共采集了296份……样本。采样工具包括网目尺寸为5厘米、外网目尺寸为10厘米的漂流刺网、网目尺寸为1厘米的底栖网箱以及钓竿（4.5米和5.4米）。分析了水库中……的年龄结构和生长特征。结果表明，采样鱼的体长范围为100.53至305.30毫米，优势体长组为100.53 - 150.00毫米，占总数的90.09%。体重范围为24.20至490.20克，优势体重组低于66.5克，占89.86%。种群年龄组成包括1 - 5龄，其中1 - 2龄占主导，占总样本的96.2%。其中，1龄个体数量最多，占78.3%，而大龄鱼相对较少。体长（）与体重（）的关系模型为 = 4.298 × 10 （ = 0.998， = 296）。冯·贝塔朗菲生长方程为 = 652.866 [1 - （）]和 = 4990.21 [1 - （）]，生长系数 = 0.108。通过拟合生长速率和加速度方程，确定生长拐点为1.9年。 < 3表明为异速生长，即体长增长快于体重，这表明……优先伸长身体以增强游泳能力和扩大活动范围，同时以较慢速度积累肌肉和脂肪。主成分分析（PCA）显示，前三个主成分的累积贡献率为55.45%，反映了该物种的形态特征。基于外部形态进行性别判别分析的准确率为67.20%，表明仅使用形态特征进行性别鉴定的可靠性有限。
